CN103922549B - A kind of coal gasification waste water treatment and reuse method and device thereof - Google Patents
A kind of coal gasification waste water treatment and reuse method and device thereof Download PDFInfo
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Abstract
The invention belongs to field of industrial waste water treatment, relate to a kind of coal gasification waste water treatment and reuse method and device thereof, the method the coal gasification waste water that coal pressure gasification produces is carried out successively middle pressure stripping, heat exchange preheating/cooling, shallow air-floatation, acidication, anaerobic-aerobic biological treatment, membrane biological reaction, ozone oxidation, the absorption of thing charcoal, multi-medium filtering, self-cleaning filtering, ultrafiltration, security personnel's filtration, reverse osmosis, ion-exchange absorption art breading and reuse, sends into high pressure boiler water supply system.The method of various improvement waste water is optimized combination by the present invention, solves the problem that coal gasification waste water process is difficult to qualified discharge and reuse " zero-emission ".
Description
Technical field
The invention belongs to field of industrial waste water treatment, especially relate to a kind of coal gasification waste water treatment and reuse processing method.The invention still further relates to a kind of device for realizing the method.
Background technology
In recent years, be used widely in the coal chemical engineering equipments such as the strange pressurized coal gasification technology in Shandong gas maked coal at home, coal ammonia, coal liquifaction, but, this technological process can produce a large amount of high pollution waste water, water-quality constituents is complicated, a large amount of suspended solids and water-soluble inorganic compound is not only there is in waste water, containing a large amount of phenolic compounds, benzene and its derivative, pyridine etc., also containing hazardous and noxious substances such as cyanogen, inorganic fluorion and ammonia nitrogens, pollutent colourity is dark, belongs to the high-concentration organic industrial waste water compared with difficult for biological degradation.Therefore, the process of coal gasification waste water is a great problem of domestic and international field of waste water treatment always.
Due to coal gasification waste water in fact all from syngas saturation moisture condensation get off, therefore, dissolve or be suspended with coal gas waste water in containing multiple components.Pollutent in waste water can because ature of coal is different with gasifying process difference to some extent, Lurgi furnace coal gasification technical maturity, but gasification temperature is low, generation waste component is complicated, and waste water generally in Vandyke brown, has certain viscosity, many foams, pH value fluctuates in 6.5 ~ 8.5 scopes, in neutral meta-alkali, has strong phenol, ammonia smells taste.General COD value at about 2000mg/L, ammonia nitrogen concentration 2000 ~ 6000mg/L, oil-contg about 60mg/L.The domestic and international mode generally adopting chemical separating to combine with biochemical treatment is to process such waste water.Chemical separating comprises the unit processes such as stripping, extraction, rectifying, to remove sour gas, reclaims the material such as phenol, ammonia, and then carries out biochemical treatment, but all can not reach emission request.
At present, the technology of domestic gas treatment waste water also has following several.
(1) new physico-chemical process
New physico-chemical process refers to and utilizes objectionable impurities in waste water to react with the medicament (sewage spirit) developed for processing waste water specially at normal temperatures, through 4 different agent-feeding treatment, finally realizes COD, BOD, NH
3-N, SS all reach emission request.The maximum defect of this technology is that in waste water, hazardous and noxious substances is the transfer of form, and this maturity of technology also needs the test through engineering practice in addition.
(2) HSB method process waste water
HSB(HighSotutionBacteria) be the english abbreviation of polymer flora.Current domestic tentative experiment draws to draw a conclusion: it is good that HSB tolerates hazardous and noxious substances in waste water; After process, mud is few, effluent color dilution good; Caustic dosage is 1/3 ~ 1/5 of traditional method, and working cost is lower, but understands not yet completely strain properties, life condition, purification function, needs further Researching and practicing.
(3) Fenton reagent treatment technology
The destruction of Fenton reagent to organic molecule is very effective, and its essence is that the chain reaction catalysis between ferrous ion and hydrogen peroxide generates OH free radical, ferric ion catalyzer (Fenton class reagent) also can excite this to react.The OH free radical that these two reactions generate can be oxidized various poisonous with unmanageable organic compound effectively.
(4) microwave and ultrasonication technology
Utilizing chemical pollutant in microwave and ultrasonic degradation water, the organic pollutant of especially difficult degradation, is the novel treatment technology grown up in recent years.For liquid, microwave only works to polar molecule wherein, and microwave electromagnetic field energy makes polar molecule produce high speed rotating collision and produce heat effect, reduces reaction activity and chemical bond strength; In microwave field, violent polar molecule concussion, can make chemical bond rupture, therefore can be used for the degraded of pollutent.Ultrasonic wave is made up of the compressional wave of a series of density interphase, and is propagated to surrounding by liquefied medium, and research shows, comprising halogenated aliphatic hydrocarbon, monocycle and polynuclear aromatics and aldehydes matter etc. can by ultrasonic degradation.
To the process of coal gasification waste water, process by physics, physical chemistry, chemistry, biological method merely, being difficult to reach emission standard, often needing the treatment system by being made up of several method, just can reach the degree of processing requirements.Therefore only improve constantly the processing power of existing treatment technology, various methodological science is reasonably combined, the best approach that just can find and administer coal gasification waste water of learning from other's strong points to offset one's weaknesses.
Summary of the invention
The present invention aims to provide a kind of new coal gasification waste water treatment and reuse method, and is applicable to the production equipment of the method.
Coal gasification waste water treatment and reuse method provided by the invention, comprise: the coal gasification waste water that coal pressure gasification produces is entered stripping tower after preheating, simultaneously, alkali lye is added in stripping tower, carried out discharging at the bottom of tower after volatile substances is removed by middle pressure stripping to the waste water adding alkali lye by the middle pressure steam entered from stripping tower 3 bottom, after heat exchange cooling, carry out aerating regulation successively, shallow air-floatation, acidication process, enter anaerobic-aerobic biological treatment pond (being called for short: A/O pond) again, organism and ammonia nitrogen etc. are degraded, membrane biological reaction is carried out in the water outlet in Aerobic biological process pond (being called for short: O pond), mud-water separation is carried out to the mixed solution of membrane biological reaction, then ozone oxidation is carried out, the pollutent of difficult degradation in waste water is decomposed into small-molecule substance to remove, to degrade further remaining organism through biological adsorption, water outlet after absorption is carried out multi-medium filtering successively, self-cleaning filtering, ultrafiltration, security personnel's filtration treatment, water outlet after process is through through reverse osmosis, ion-exchange absorption art breading and reuse, send into high pressure boiler water supply system,
Saturation steam containing volatile substances after stripping is discharged from stripper top, delivers to vapourizing furnace, recycle as vaporized chemical.
Wherein, the filtering accuracy of described self-cleaning filtering technique is 100 μm, and the filtering accuracy of described security personnel's filtration process is 5 μm.
In addition, for preventing through except the gas liquor after ammonia is after interchanger heat exchange cooling bottom stripping tower, temperature is still higher, can by coal gasification waste water cool through heat exchange by water cooler again cooling process.
Device for realizing the inventive method comprises:
High pressure gas water pump 1, is communicated with interchanger 2, for being sent to gas liquor interchanger 2 through pretreated coal gasification waste waters such as tar separation, light oil separation, two media filtrations;
Stripping tower 3, the gas liquor import of stripping tower 3 and the gas liquor outlet of interchanger 2, for receiving the gas liquor through thermal pretreatment that interchanger 2 transports, hot steam import is pressed through in being provided with bottom stripping tower 3, press through hot steam in convenient directly to pass into, stripping tower 3 top is provided with air outlet, goes out CO in tower for stripping
2, H
2s, NH
3with volatile substances such as micro-rare gas elementes, the saturation steam after stripping is sent to vapourizing furnace, recycles as vaporized chemical;
Volume pump 4, with the alkali lye inlet communication of stripping tower 3, carries alkali lye by volume pump 4 to stripping tower 3;
Aerating regulation pond 5, with the gas liquor outlet of interchanger 2, for receiving from the cooled gas liquor of interchanger 2 heat exchange, with sanitary sewage, synthesizing battery limit (BL) and rinses terrace water, synthesizes wastewater containing methanol and mix in aerating regulation pond 5;
Shallow air-floatation device 7, is communicated with lift pump 6, for receiving the mixed solution in the aerating regulation pond 5 of lift pump 6 conveying, it being carried out oil removing to waste water in shallow air-floatation device 7 and removes suspended substance;
The hydrolysis acidification pool 8 of built-in combined stuffing 9, for receiving the waste water through shallow air-floatation device 7 coagulating kinetics;
A/O pond 10,12, in anaerobic biological treatment pond (being called for short: A pond) 10, diving mixer 11 is installed, mixed-liquor return pump 13 is set between A pond 10 and O pond 12, A pond 10 is communicated with hydrolysis acidification pool 8 water outlet, in A pond 10, anaerobic biological treatment is carried out for the waste water after being processed by hydrolysis acidification pool 8, Aerobic biological process is carried out, the organic pollutant in effective degradation of sewage and ammonia nitrogen pollutant in O pond 12;
Membrane biological reaction pond (being called for short: MBR membrane cisterna) 14, sludge reflux pump 15 is provided with in the bottom of MBR membrane cisterna 14, the fluid inlet of MBR membrane cisterna 14 is communicated with the liquid outlet in O pond 12, for passing through the organic pollutant in the metabolism degrading waste water of aerobic microbiological, by MBR film, mud-water separation is carried out to mixed solution, more isolated mud is back to A/O pond 10,12 by sludge reflux pump 15 carries out anaerobic-aerobic biological treatment;
Ozone oxidation pond 17, be communicated with MBR membrane cisterna 14 by vacuum primingpump 16, waste water in MBR membrane cisterna 14 after mud-water separation is evacuated to ozone oxidation pond 17 by vacuum primingpump 16 and carries out hybrid reaction with ozone, the pollutent of difficult degradation in waste water is decomposed into small-molecule substance and removes;
Charcoal pond 18, is communicated with ozone oxidation pond 17 liquid outlet, for being degraded further in charcoal pond 18 by the remaining organism after ozone oxidation pond 17 processes;
Clean water basin 19, are communicated with charcoal pond 18, for receiving the water processed through charcoal pond 18 that water pump transports;
More medium filter 21, is communicated with clean water basin 19 by topping-up pump 20, realizes the water outlet in clean water basin 19 by carrying out multi-medium filtering after topping-up pump 20 supercharging;
Ultra-filtration equipment 23, arranges self-cleaning filter 22 before ultra-filtration equipment 23, and more medium filter 21, water outlet are delivered to ultra-filtration equipment 23 through self-cleaning filter 22 and filter further and enter ultrafiltration water tank 24 and store;
Ultrafiltration water pump 25, the fluid inlet of ultrafiltration water pump 25 is communicated with the liquid outlet of ultrafiltration water tank 24, the liquid outlet of ultrafiltration water pump 25 is communicated with cartridge filter 26 fluid inlet, cartridge filter 26 is communicated with successively with high-pressure pump 27, reverse osmosis unit 28, intermediate water tank 29, for ultra-filtration water is carried out a series of filtration, infiltration, the dilute concentration water that reverse osmosis process produces sends into intermediate water tank 29, and strong brine case sent into by strong brine;
Cation exchange bed 31, is communicated with intermediate water tank 29 by middle water pump 30, for the water of intermediate water tank 29 is delivered to cation exchange bed 31 by middle water pump 30, removes the positively charged ion in water;
Decarbonizer 32, is communicated with cation exchange bed 31, carries out CO2 removal for the water that will have removed through positively charged ion;
Anion exchange bed 33, with the outlet of decarbonizer 32, removes for the water carrying out positively charged ion and CO2 removal is carried out negatively charged ion;
Mixed bed 34, the fluid inlet of mixed bed 34 is communicated with the liquid outlet of anion exchange bed 33, the liquid outlet of mixed bed 34 is communicated with desalination water tank 35, for by through tentatively remove positively charged ion, carbonic acid gas, negatively charged ion water deliver to mixed bed 34, after removing zwitterion remaining in water further, deliver to desalination water tank 35 as high pressure boiler water supply.
As a kind of preferred implementation, described shallow air-floatation device 7 is positioned at the top in hydrolysis acidification pool 8 and A/O pond 10,12, avoids secondary water-supply.
As a kind of preferred implementation, described ultra-filtration equipment 23 adopts cross flow filter, PLC to control the operation scheme of alternately backwash automatically, and backwash adopts air-water associated form, and hyperfiltration reverse-rinsing water is delivered to aerating regulation pond 5.
As a kind of preferred implementation, the double-layer filter material that described more medium filter 21 uses be place lighter macrobead hard coal on filtering layer top, bottom is large proportion, small-particle quartz sand, filtering layer efficiency is high, retaining power is strong.
As a kind of preferred implementation, described reverse osmosis unit 28 can be one-level, secondary or multistage.
As a kind of preferred implementation, this device is also provided with water cooler 36, is connected between interchanger 2 and aerating regulation pond 5, cools for the gas liquor of temperature drift after interchanger 2 heat exchange cooling is delivered to water cooler 36 again.
The present invention compared with prior art tool has the following advantages.
1. this wastewater treatment and renovation combination process processing power is large, and plant area area is little.
2. adopt " middle pressure stripping+shallow air-floatation+acidication+A/O+MBR film+ozone oxidation+charcoal+multi-medium filtering+self-cleaning filtering+ultrafiltration+security personnel's filtration+reverse osmosis membrane+ion-exchange absorption " treatment and reuse combination process, by wastewater treatment and boiler feed water system can be back to use, realize the reuse of coal gasification waste water.
3. there is the process optimization of collection combination process, and operation is controlled in the practicality of one.
Accompanying drawing explanation
Accompanying drawing 1 is the process flow sheet of coal gasification waste water treatment and reuse of the present invention.
Accompanying drawing 2 is the process flow sheet of the specific embodiment of the invention.
1-high pressure gas water pump, 2-interchanger, 3-stripping tower, 4-volume pump, 5-aerating regulation pond, 6-lift pump, 7-shallow air-floatation device, 8-hydrolysis acidification pool, 9-combined stuffing, 10-anaerobic biological treatment pond (being called for short: A pond), 11-diving mixer, 12-Aerobic biological process pond (being called for short: O pond), 13-mixed-liquor return pump, 14-membrane biological reaction pond (being called for short: MBR membrane cisterna), 15-sludge reflux pump, 16-vacuum primingpump, 17-ozone oxidation pond, 18-charcoal pond, 19-clean water basin, 20-topping-up pump, 21-more medium filter, 22-self-cleaning filter, 23-ultra-filtration equipment, 24-ultrafiltration water tank, 25-ultrafiltration water pump, 26-cartridge filter, 27-reverse osmosis high-pressure pump, 28-reverse osmosis unit, 29-intermediate water tank, water pump in the middle of 30-, 31-cation exchange bed, 32-decarbonizer, 33-anion exchange bed, 34-mixed bed, 35-desalination water tank, 36-water cooler.
Embodiment
For disclosing processing technology routine of the present invention further, be described in detail below in conjunction with Figure of description 2 pairs of operational paths.
The coal gasification waste water that transports from coal pressurizing gasifying apparatus is separated through tar separation, light oil, after two media filtration pre-treatment, middle pressure stripping is carried out by high pressure gas water pump 1, then gas liquor is delivered to interchanger 2 and carries out preheating, gas liquor after preheating enters stripping tower 3 and carries out middle pressure stripping, in press through hot steam and directly pass to bottom stripping tower, the alkali lye of 20% is sent to the feeding line of stripping tower by alkali lye volume pump 4, stripping goes out CO
2, H
2s, NH
3with the volatile substances such as micro-rare gas element, the saturation steam after stripping is sent to vapourizing furnace, and as vaporized chemical recycling, what produce in stripping tower 3 delivers to interchanger 2 through the high-temperature coal air water after ammonia and carry out heat exchange cooling.
Gas liquor temperature drift after heat exchange cooling process is sent to water cooler 36 and proceeds cooling process, be sent to aerating regulation pond 5 and sanitary sewage again, synthesize battery limit (BL) and rinse terrace water, synthesize wastewater containing methanol and fully mix, the waste water mixed is promoted in shallow air-floatation device 7 by lift pump 6 and carries out oil removing to waste water and remove suspended substance.
Waste water after coagulating sedimentation enters the hydrolysis acidification pool 8 of built-in combined stuffing 9, hydrolysis acidification pool water outlet enters A/O pond 10,12, mixed-liquor return pump 13 is set between A pond 10 and O pond 12, A pond 10 is communicated with hydrolysis acidification pool 8 water outlet, in A pond 10, anaerobic biological treatment is carried out for the waste water after being processed by hydrolysis acidification pool 8, Aerobic biological process is carried out in O pond 12, organic pollutant in effective degradation of sewage and ammonia nitrogen pollutant, wherein shallow air-floatation device 7 is positioned at the top in hydrolysis acidification pool 8 and A/O pond 10,12, avoids secondary water-supply.
The water outlet in O pond is entered MBR membrane cisterna 14, sludge reflux pump 15 is provided with in the bottom of MBR membrane cisterna 14, for passing through the organic pollutant in the metabolism degrading waste water of aerobic microbiological, by MBR film, mud-water separation is carried out to mixed solution, more isolated mud is back to A/O pond 10,12 by sludge reflux pump 15 carries out anaerobic-aerobic biological treatment.
The water carrying out mud-water separation in MBR membrane cisterna 14 is evacuated to ozone oxidation pond 17 by vacuum primingpump 16 and carries out hybrid reaction with ozone, the pollutent of difficult degradation in waste water is decomposed into small-molecule substance to remove, waste water after process sends into organism remaining in the further degrading waste water in charcoal pond 18 again, the water outlet in charcoal pond 18 is delivered to clean water basin 19 by water pump, the water outlet of clean water basin 19 carries out supercharging by topping-up pump 20, deliver to more medium filter 21 again to filter, wherein, the double-layer filter material that more medium filter 21 uses places lighter macrobead hard coal on filtering layer top, bottom is large proportion, small-particle quartz sand, filtering layer efficiency is high, retaining power is strong.
The water outlet of more medium filter 21 is delivered to ultra-filtration equipment 23 by self-cleaning filter 22 and is filtered further and enter ultrafiltration water tank 24 and store, wherein the filtering accuracy of self-cleaning filtering technique is 100 μm, wherein, filter device 23 adopts cross flow filter, PLC to control the operation scheme of alternately backwash automatically, backwash adopts air-water associated form, and hyperfiltration reverse-rinsing water is delivered to aerating regulation pond 5.
The water outlet of ultra-filtration equipment 23 passes through ultrafiltration water pump 25 through cartridge filter 26, high-pressure pump 27, enter reverse osmosis unit 28, reverse osmosis unit produces water and enters intermediate water tank 29, ultra-filtration water carries out a series of filtration, infiltration, the dilute concentration water that reverse osmosis unit 28 produces sends into intermediate water tank 29, strong brine case sent into by strong brine, and wherein, the filtering accuracy of security personnel's filtration process is 5 μm.
The water outlet of intermediate water tank 29 is sloughed most of positively charged ion in water by being delivered to cation exchange bed 31 by middle water pump 30, then deliver to decarbonizer 32 and remove carbonic acid gas in water, the water removed after most of carbonic acid gas is delivered to anion exchange bed 33 and is removed most of negatively charged ion in water, then deliver to mixed bed 34 and remove zwitterion remaining in water further, mixed bed water outlet delivers to desalination water tank 35 as high pressure boiler water supply.
Claims (9)
1. a coal gasification waste water treatment and reuse method, comprise: the coal gasification waste water that coal pressure gasification produces is entered stripping tower after preheating, simultaneously, alkali lye is added in stripping tower, carried out discharging at the bottom of tower after volatile substances is removed by middle pressure stripping to the waste water adding alkali lye by the middle pressure steam entered from stripping tower bottom, after heat exchange cooling, carry out aerating regulation successively, shallow air-floatation, acidication process, enter anaerobic-aerobic biological treatment pond again, organism and ammonia nitrogen are degraded, membrane biological reaction is carried out in the water outlet in Aerobic biological process pond, mud-water separation is carried out to the mixed solution after membrane biological reaction, then ozone oxidation is carried out, the pollutent of difficult degradation in waste water is decomposed into small-molecule substance to remove, to degrade further remaining organism through biological adsorption again, water outlet after absorption is carried out multi-medium filtering successively, self-cleaning filtering, ultrafiltration, security personnel's filtration treatment, water outlet after process is through reverse osmosis, ion-exchange absorption art breading and reuse, send into high pressure boiler water supply system,
Saturation steam containing volatile substances after stripping is discharged from stripper top, delivers to vapourizing furnace, recycle as vaporized chemical.
2. method as claimed in claim 1, is characterized in that: also comprise the coal gasification waste water that cools through heat exchange by water cooler cooling process again.
3. method as claimed in claim 1 or 2, is characterized in that: described through the cooled coal gasification waste water of heat exchange and sanitary sewage, synthesize battery limit (BL) and rinse terrace water, synthesize wastewater containing methanol and mix and carry out aerating regulation.
4., for implementing the claims a device for method described in 1, described device comprises:
High pressure gas water pump (1), is communicated with interchanger (2), for being sent to gas liquor interchanger (2) through tar separation, light oil separation, the pretreated coal gasification waste water of two media filtration;
Stripping tower (3), the gas liquor import of stripping tower (3) and the gas liquor outlet of interchanger (2), for receiving the gas liquor through thermal pretreatment that interchanger (2) transports, hot steam import is pressed through during stripping tower (3) bottom is provided with, press through hot steam in convenient directly to pass into, stripping tower (3) top is provided with air outlet, goes out the volatile substances in tower for stripping, saturation steam after stripping is sent to vapourizing furnace, recycles as vaporized chemical;
Volume pump (4), with the alkali lye inlet communication of stripping tower (3), by volume pump (4) to stripping tower (3) conveying alkali lye;
Aerating regulation pond (5), with the gas liquor outlet of interchanger (2), for receiving from the cooled gas liquor of interchanger (2) heat exchange;
Shallow air-floatation device (7), is communicated with lift pump (6), for receiving the mixed solution in aerating regulation pond (5) that lift pump (6) carries, in shallow air-floatation device (7), carries out oil removing and oil removal to mixed solution;
The hydrolysis acidification pool (8) of built-in combined stuffing (9), for receiving the waste water through shallow air-floatation device (7) coagulating kinetics;
Anaerobic-aerobic biological treatment pond (10, 12), in anaerobic biological treatment pond (10), diving mixer (11) is installed, mixed-liquor return pump (13) is set between anaerobic biological treatment pond (10) and Aerobic biological process pond (12), anaerobic biological treatment pond (10) is communicated with hydrolysis acidification pool (8) water outlet, in anaerobic biological treatment pond (10), anaerobic biological treatment is carried out for the waste water after being processed by hydrolysis acidification pool (8), Aerobic biological process is carried out in Aerobic biological process pond (12), organic pollutant in effective degradation of sewage and ammonia nitrogen pollutant,
Membrane biological reaction pond (14), sludge reflux pump (15) is provided with in the bottom of membrane biological reaction pond (14), the fluid inlet in membrane biological reaction pond (14) is communicated with the liquid outlet of Aerobic biological process pond (12), for passing through the organic pollutant in the metabolism degrading waste water of aerobic microbiological, by film, mud-water separation is carried out to mixed solution, more isolated mud is back to anaerobic-aerobic biological treatment pond (10,12) is carried out anaerobic-aerobic biological treatment by sludge reflux pump (15);
Ozone oxidation pond (17), be communicated with membrane biological reaction pond (14) by vacuum primingpump (16), waste water in membrane biological reaction pond (14) after mud-water separation is evacuated to ozone oxidation pond (17) by vacuum primingpump (16) and carries out hybrid reaction with ozone, the pollutent of difficult degradation in waste water is decomposed into small-molecule substance and removes;
Charcoal pond (18), is communicated with ozone oxidation pond (17) liquid outlet, for being degraded further in charcoal pond (18) by the remaining organism after ozone oxidation pond (17) process;
Clean water basin (19), are communicated with charcoal pond (18), for receiving the water processed through charcoal pond (18) that water pump transports;
More medium filter (21), is communicated with clean water basin (19) by topping-up pump (20), realizes the water outlet in clean water basin (19) to carry out multi-medium filtering by after topping-up pump (20) supercharging;
Ultra-filtration equipment (23), arranges self-cleaning filter (22) ultra-filtration equipment (23) is front, the water outlet of more medium filter (21) is delivered to ultra-filtration equipment (23) through self-cleaning filter (22) and filters further and enter ultrafiltration water tank (24) and store;
Ultrafiltration water pump (25), the fluid inlet of ultrafiltration water pump (25) is communicated with the liquid outlet of ultrafiltration water tank (24), the liquid outlet of ultrafiltration water pump (25) is communicated with cartridge filter (26) fluid inlet, cartridge filter (26) is communicated with successively with high-pressure pump (27), reverse osmosis unit (28), intermediate water tank (29), for ultra-filtration water is carried out a series of filtration, infiltration, the dilute concentration water that reverse osmosis process produces sends into intermediate water tank (29), and strong brine case sent into by strong brine;
Cation exchange bed (31), be communicated with intermediate water tank (29) by middle water pump (30), for the water of intermediate water tank (29) is delivered to cation exchange bed (31) by middle water pump (30), the positively charged ion in water is removed;
Decarbonizer (32), is communicated with cation exchange bed (31), carries out CO2 removal for the water that will have removed through positively charged ion;
Anion exchange bed (33), with the outlet of decarbonizer (32), removes for the water carrying out positively charged ion and CO2 removal is carried out negatively charged ion;
Mixed bed (34), the fluid inlet of mixed bed (34) is communicated with the liquid outlet of anion exchange bed (33), the liquid outlet of mixed bed (34) is communicated with desalination water tank (35), for by through tentatively remove positively charged ion, carbonic acid gas, negatively charged ion water deliver to mixed bed (34), after removing zwitterion remaining in water further, deliver to desalination water tank (35) as high pressure boiler water supply.
5. device as claimed in claim 4, is characterized in that: described shallow air-floatation device (7) is positioned at the top of hydrolysis acidification pool (8) and anaerobic-aerobic biological treatment pond (10,12), avoids secondary water-supply.
6. device as claimed in claim 4, it is characterized in that: the backwash water outlet of described ultra-filtration equipment (23) and the backwash water inlet communication in aerating regulation pond (5), for controlling the automatic hyperfiltration reverse-rinsing water replacing backwash by ultra-filtration equipment (23) be delivered to aerating regulation pond (5) through cross flow filter, PLC.
7. device as claimed in claim 4, is characterized in that: lighter hard coal is placed on the top of described more medium filter (21), and the quartz sand of large proportion is placed in bottom, for improving filtration and the retaining power of filtering layer.
8. device as claimed in claim 4, is characterized in that: described reverse osmosis unit (28) can be one-level, secondary or multistage.
9. device as claimed in claim 4, it is characterized in that: this device is also provided with water cooler (36), be connected between interchanger (2) and aerating regulation pond (5), cool again for the gas liquor of temperature drift after interchanger (2) heat exchange cooling is delivered to water cooler (36).
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| CN101993173A (en) * | 2009-08-31 | 2011-03-30 | 吉林东圣焦化有限公司 | Improved alkaline process flow with coking sewage treatment (A/O) method |
| CN103288309A (en) * | 2013-07-01 | 2013-09-11 | 大唐国际化工技术研究院有限公司 | Coal gasification wastewater zero-emission treatment method, treatment system and application thereof |
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| CN101993173A (en) * | 2009-08-31 | 2011-03-30 | 吉林东圣焦化有限公司 | Improved alkaline process flow with coking sewage treatment (A/O) method |
| CN101786767A (en) * | 2010-03-05 | 2010-07-28 | 中冶焦耐(大连)工程技术有限公司 | Advanced treatment process of coking waste water by combining ozone oxidation method and membrane separation technology |
| CN103288309A (en) * | 2013-07-01 | 2013-09-11 | 大唐国际化工技术研究院有限公司 | Coal gasification wastewater zero-emission treatment method, treatment system and application thereof |
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